Reverse osmosis systems

Reverse osmosis treats one tap. NSF/ANSI 58 is the usual certification path when a unit is listed for arsenic, nitrate, or fluoride.

It does not treat showers, laundry, or whole-house hardness. Confirm the listing for pentavalent arsenic, trivalent arsenic, or both if arsenic is why you are here.

12 products with an in-stock listing, sorted by first-year cost. Ranked for a named water profile only on system and ZIP pages.

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Product	Certified for	Install
APEC ROES-50 Essence 5-Stage Reverse Osmosis	Total Dissolved Solids	DIY
Aquasana OptimH2O Reverse Osmosis + Claryum	Arsenic, Asbestos, Benzene, Chlorine (residual), Total Coliform and 12 more	DIY
Bluevua RO100ROPOT Countertop Reverse Osmosis System	manufacturer-reported only	DIY
Brondell Circle RC100 Reverse Osmosis System	Arsenic, Barium, Benzene, Cadmium, Chlorine (residual) and 13 more	DIY
Express Water RO5DX 5-Stage Reverse Osmosis System (50 GPD)	manufacturer-reported only	DIY
Frizzlife PD600-TAM3 Tankless RO with Alkaline Remineralization (600 GPD)	manufacturer-reported only	DIY
Home Master TMAFC-ERP Artesian Full Contact RO with Permeate Pump	manufacturer-reported only	DIY
iSpring RCC7AK 6-Stage Alkaline Reverse Osmosis	Total Dissolved Solids	DIY
SimPure T1-400 Tankless UV Reverse Osmosis System (400 GPD)	manufacturer-reported only	DIY
Waterdrop G2P600 Tankless Reverse Osmosis System (600 GPD)	manufacturer-reported only	DIY
Waterdrop G3P600 Tankless Reverse Osmosis System (600 GPD)	Cadmium, Chlorine (residual), Chromium (total), Fluoride, Selenium and 1 more	DIY
Waterdrop G3P800 Tankless Reverse Osmosis with UV	PFOA, PFOS, Total Dissolved Solids	DIY